Study On Ecological Security Evaluation Of Cultivated Land In Mulei County

Cultivated land is the most special part of land resources.It is the carrier of crop growth and the basis of agricultural production.It is related to the long-term survival and development of human beings.With the continuous advancement of urbanization,the area of arable land in China has gradually shrunk,and the quality of arable land has continued to decline due to the excessive use of chemical fertilizers and pesticides.Ecological problems have occurred frequently,and human-land conflicts have become increasingly prominent.In recent years,food security and ecological security issues have been mentioned many times in important government meetings.At the same time,the country has begun to vigorously promote ecological agriculture,and the ecological problems of arable land have become more and more popular.The arid area taking Mulei County as an example is a typical representative of the fragile cultivated land ecology.Studying the ecological security of the cultivated land in the arid area is of great significance for protecting the healthy development of the cultivated land ecosystem in China.In this paper,Mulei County is used as the research area.From the aspects of economic,social,and ecological aspects,according to the study of resource endowment and regional characteristics,the emergy analysis theory is combined with traditional indicators.The PSR model is used to construct an evaluation system framework.Qualitative analysis of the historical evolution of cultivated land ecological security in Mulei County from 2008 to 2017 from three levels of ecological security pressure,status,and response;and then supported by land use change survey data and statistical yearbook data.The entropy method determines the index weights,refers to the relevant regulations and regional standards,uses the set pair analysis model,calculates the index connection degree,and determines the ecological security level and cultivated land ecological security status of Mulei County in each stage from 2008 to 2017.Finally,the diagnosis model of cultivated land obstacle factor was used to calculate the factor contribution,deviation and obstacle degree of each index,so as to identify the main obstacle factors that hinder the ecological safety of cultivated land in Mulei County,and finally aimed at the obstacles of cultivated land ecological safety in Mulei County.Factors propose related countermeasures.Research indicates:(1)Through the analysis of the ecological security change of cultivated land in Mulei County from 2008 to 2017,it was found that the ecological security of cultivated land in Mulei County showed a rising trend.From the perspective of ecological safety level,Mulei County was in the level Ⅲ critical safety level from 2008 to 2012,and the connection degree range was-0.0275 to 0.1531.From 2013 to 2014,it fluctuated between level Ⅱ and level Ⅲ,from 0.2455.It dropped to 0.1946;then from 2015 to 2017,it was stable in a level Ⅱ safer state,but the connection degree dropped from 0.3775 to 0.2828.Although the overall security level trend is improving,the decline in the connection trend indicates that the ecological security status of cultivated land in Mulei County has risks in the past two years,and it is necessary to consolidate the results of ecological governance and prevent new ecological security risks.(2)Through the calculation of the ecological security of the cultivated land in Mulei County from 2008 to 2017 by the diagnostic model of obstacle factors,it is found that:the pressure system has a negative impact on the ecological security of the cultivated land in Mulei County from the beginning to the end;with the passage of time,the negative impact of the state system has gradually increased with the change of time;the obstacle degree of each factor in the response system has been decreasing year by year;the per capita net income of farmers It has become the main obstacle to the ecological security of cultivated land in Mulei County.(3)In terms of future cultivated land use and ecological security protection,Mulei County should focus on the protection of cultivated land,control the load of cultivated land,increase scientific and technological investment in improving the quality of cultivated land,and enhance the comprehensive benefits of cultivated land.Development.